Self-piercing clinch nut



FIG. 1 is a perspective view of a self-piercing clinch nut in accordance with the present design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirror image of the right side view; and,

FIG. 5 is a top plan view thereof, the bottom plan view being a mirror image of the top plan view.

The broken lines are included for the purpose of illustrating environment and form no part of the claimed design. 

CLAIM The ornamental design for a self-piercing clinch nut, as shown and described. 